John Carmack tweets more about the upcoming release of the DOOM 3 source code, indicating he is rewriting some code for legal reasons: "Lawyers are still skittish about the patent issue around "Carmack's reverse", so I am going to write some new code for the doom3 release."

Huh? EAX has been useless since the audio stack got rewritten in Vista. All modern game audio is done completely in software, and AFAIK you have to do special tricks (Alchemy?) to use EAX in the older games that used it if you run them on Vista or later.